About 40K ago I changed plugs to the Iridium IX. I actually didn't notice any performance improvement over the stock platinum plugs. Now I notice that my milege ras rolled off about 15% (I have cleaned the air filter and run injector cleaner through). My mechanic tells me that I put in the wrong plugs... that the Iridium IX are a great plug for NON platinum designs.

Does anyone concur with this??? I know of lots who have switched to the IX and really like them.

Would switching plugs help gas mileage??

 

I don't think you rmechanic knows his ass from a hole in the ground. Iridium has better conductivity than platinum, and lasts almost as long. Besides, our cars come with iridium plugs OEM.

 

Yup... I kind of thought that he was full of shit, but I thought that I would ask you guys. I thought that OEM CLS plugs were platinum though?

And... a final question... what is the life of the IX plugs? Should I be changing them? I have 40K miles on them.

Appreciate your input!

 

so can anyone tell me if these "stock" plugs be bought at autozone?? Do I have to go to the dealer to get them?? I put bosche plus 2's in about 1 month ago and my has mileage has went to CRAP. is it the plugs?? nothing else has changed, everything is stock.

 

not go at autozone....you can get them elsewhere or at the dealer (over $20 a piece )

 

Ummm...no they don't. Just pulled mine out to check 'em this morning; they're NGK Double Platinum P/N PZFR6E-11. You can get a set of 6 here for reasonable $$:

http://www.2kracing.com/product_info...oducts_id/4497

Iridiums are even less...just browse the site above a little - P/N IZFR6K-11.

Loc

 

Try Bosch Plus+4s- I can even burn regular gas on occasion! Mileage up slightly. No noticeable power gain, but smooth running.

 

I got my plugs at advanced auto parts I tried Autozone for some reason they didn't have 'em at my local store